This question has one of the simplest answers in the Bible. But it is sometimes complicated to the point of people missing the point entirely. Gospel means “good news.” So the good news is about the Messiah and an invitation to enter into an eternal relationship with God.
The easiest and most straight forward answer comes from the Lord Jesus Christ. He said “For God so loved the world that he gave his only begotten son that whosoever believes in Him shall not perish but have everlasting life.” (John 3:16)
Jesus is the good news of the Bible
Believing in Jesus means believing that He is the Messiah. Who has come to take the sins of the world on His shoulders and offer His life on the cross. This is good news. Because all of us are sinners. We have broken the commandments, all of them, and are destined for eternal separation from God (hell).
It’s good news because Jesus took all of that and took the blame for our sins. Imagine the entirety of the sins of all people, past, present and future! The bad news is that without Jesus you’re doomed. The good news you are offered an everlasting life in God’s Kingdom.
The Gospel is simple
It’s really that simple. A child can understand it. We sometimes get caught up in wanting to pay our own way. Trying to buy our salvation, to deserve it, or earn it. We can’t. Only Jesus could/can pay that price.
It’s not that you are any worse or better than I am. The Apostle Paul said “All have sinned and fall short of the glory of God.” (Romans 3:23). Also, He later wrote: “For the wages of sin is death, but the GIFT of God is eternal life through Christ Jesus our Lord” (Romans 6:23)
People trip over the idea that mere faith can make the difference between heaven and hell. God’s grace is what spares us, not our goodness, our deeds or any other earthy quality.
For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God. (Ephesians 2:8)
We must turn to Him for EVERYTHING!
It is God’s plan that we turn to Him for everything. If we can’t earn it, or buy it. There isn’t any other means wash our sins away, who are we to trust and turn to?
It is our belief, by faith, that Jesus died on the cross for our sins and rose again from the grave and now sits at the right hand of God the Father. Therefore, there is no way to prove this, so, by design, God calls us to accept this important truth by faith.
Now that is good news.